The use of the music to set scene and mood is nothing short of genius --
It has already been discussed how Richard Strauss' contribution to the score -- and how it lodged itself in the culture, but in truth The Blue Danube has now become synonymous with the elegant movements of null G. Khachaturian'a adagio, quite possibly the most beautiful peice of music i have ever heard, was also re-used in Alien when depicting the ship... another spaceship on which something goes horribly wrong. The mournful strains of the two violins playing against each other with minimal accompaniment from the rest of the orchestra does evoke a certain solitary, paranoic feeling extremely conducive to the two films.